viaduct

[vahy-uh-duhkt]
noun
a bridge for carrying a road, railroad, etc., over a valley or the like, consisting of a number of short spans.

Origin:
1810–20; < Latin via way + (aque)duct

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World English Dictionary
viaduct (ˈvaɪəˌdʌkt)
 
n
a bridge, esp for carrying a road or railway across a valley, etc, consisting of a set of arches supported by a row of piers or towers
 
[C19: from Latin via way + dūcere to bring, on the model of aqueduct]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

viaduct
1816, from L. via "road" + -duct as in aqueduct. Fr. viaduc is an Eng. loan-word.
Online Etymology Dictionary, © 2010 Douglas Harper
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Encyclopedia Britannica
Encyclopedia

viaduct

type of long bridge or series of bridges, usually supported by a series of arches or on spans between tall towers. The purpose of a viaduct is to carry a road or railway over water, a valley, or another road. The viaduct is both functionally and etymologically related to the aqueduct, which carries water; both were developed by Roman engineers.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The viaduct's south end was vulnerable in an earthquake and needed to be replaced.
Drivers will still be able to access the viaduct as they do today after the nine-day closure.
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